<ui:composition  xmlns:h="http://java.sun.com/jsf/html"
        xmlns:ui="http://java.sun.com/jsf/facelets"
        xmlns:f="http://java.sun.com/jsf/core">
 <h:panelGroup rendered="#{not empty comment}">
   --  --------------------
   --  #{comment}
   --  --------------------
 </h:panelGroup>
</ui:composition>
